Adjustable counterbalanced fluid



L. ADJUSTABLE COUNTERBALANCED FLUID s l W A n D v. a N M d Aug. 28, 1956 PRESSURE RESPONSIVE DAMPERS INVENTOR ATTORNEYS United States Patent ADJUSTABLE COUNTERBALANED FLUID PRESSURE RESPONSIVE DAMPERS Lawrance N. Davis, Raleigh, N. C.

Application May 17, 1951, Serial No. 226,899

1 Claim. (Cl. 137-=-527.8)

The present invention is directed to improvements in adjustable counterbalanced fluid pressure responsive dampers.

The primary object of the invention is to provide a damper for wood burning stoves, so constructed and arranged that the heat will be effectively controlled during variation of the temperature.

A further object of the invention is to provide a damper constructed in such manner that it can be adjusted according to the amount of heat obtained from the burning fuel.

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of certain novel details of construction and corn binations of parts hereinafter more fully described and pointed out in the claim, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

In the drawings:

Fig. 1 is a fragmentary view of a smoke pipe equipped with the damper.

Fig. 2 is a sectional view.

Fig. 3 is a view, partially in section, of the rod carrying block.

Fig' 4 is a detail side elevation thereof.

In the drawings the damper 4 is secured adjacent one side to a shaft 5, so as to move under the influence of gravity to pipe closing position. The shaft is journaled in bearings 6 formed in the smoke-conducting pipe 3, and said pipe carries exteriorly thereof, a pair of spaced stop pins 7, the purpose of which will later appear.

Fixed to one end of the shaft which extends from the pipe 3 is a block 8 hexagonal in cross section, said block having a series of bores 9 opening into which are slots 10.

A rod 11 is adjustably mounted in a selected bore 9, and retained in an adjusted position by friction.

The bores 9 are disposed in criss-cross relationship in order that the rod 11 may be engaged in a selected bore 2,760,517 Patented Aug. 28, 1956 to balance the damper, in various positions within the pipe 3. A resilient strip 12 is carried by one end of the block 8 and is movable between the pins 7 in order to absorb the shock incident to the swinging movement of the block. The rod 11 is provided with spaced pins 13 to limit the sliding movement thereof.

When a fire is burning in the stove body and the rod 1.1 is properly adjusted in the block 8 the draft created in the pipe 3 by the burning fuel will also cause the damper 4 to open or close in accordance with the passage of the draft through the pipe 3.

It will be understood that the invention which has been illustrated and described herein is usable not only with coal or wood stoves, but with any other type of heating equipment, such as oil stoves or furnaces. The invention has particularly advantageous features, for example, when used as the feed damper on oil stoves.

What is claimed is:

An elongated vertically disposed stove pipe, means for regulating the flow of fluid therethrough comprising a shaft extending transversely through said stove pipe intermediate the ends and to one side of the longitudinal axis thereof, a gravity and fluid pressure actuated damper carried to one side of a diametrical axis thereof by the shaft within the stove pipe to move with the shaft and tilt about the axis thereof to a position closing the passage through the stove pipe, a head carried by the shaft for movement therewith on the exterior of the stove pipe, said head having longitudinally spaced grooves opening through the periphery thereof, said grooves being angularly disposed to each other and extending diametrically to the damper shaft, a counterbalance mounted in a selected groove and movable longitudinally therethrough, a spring arm carried by the head and projecting laterally therefrom with respect to the axis of the damper shaft for movement therewith in an arcuate path and stop pins carried by the stove pipe and projecting outwardly therefrom into the arcuate path.

References (fitted in the file of this patent UNITED STATES PATENTS 597,427 McCarroll Jan. 18, 1898 709,673 Hemp Sept. 23, 1902 986,971 Fogelsong Mar. 14, 1911 1,034,507 Powers Aug. 6, 1912 1,272,064 Lezius July 9, 1918 1,286,489 Anderson Dec. 3, 1918 1,320,960 Anderson Nov. 4, 1919 1,572,687 Schmelz Feb. 9, 1926 1,641,875 Beaulieu Sept. 6, 1927 1,706,861 Porkorny Mar. 26, 1929 1,848,850 Sturgis Mar. 8, 1932 2,322,039 Lunda et a1. June 15, 1943 2,332,515 Hufford Oct. 26, 1943 

